Highly ordered Nanomaterial Functionalized Copper Schiff Base Framework: Synthesis, Characterization, and Hydrogen Peroxide Decomposition Performance

Abstract

An immobilized copper Schiff base tridentate complex was prepared in three steps from SBA-15 supports. The immobilized copper nanocatalyst (heterogeneous catalyst) was characterized by Fourier transform infrared spectroscopy (FT-IR), cross polarization magic angle spinning (CP-MAS), 13-carbon nuclear magnetic resonance ( 13 C-NMR), atomic absorption spectroscopy (AAS), thermogravimetric analysis (TGA), and N 2 -physisorption. Moreover, morphological and structural features of the immobilized nanocatalyst were analyzed using transmission electron microscopy (TEM) and X-ray powder diffraction spectrometry (PXRD). After characterizing the nanocatalyst, the catalytic activity was determined in hydrogen peroxide (H 2 O 2 ) decomposition. The high decomposition yield of H 2 O 2 was obtained for low-loaded copper content materials at pH 7 and at room temperature. Furthermore, the nanocatalyst exhibited high activity and stability under the investigated conditions, and could be recovered and reused for at least five consecutive times without any significant loss in activity. No copper leaching was detected during the reaction by AAS measurements.

Mesoporous Materials Prepared Using Cashew Nut Shell Liquid and Castor Oil as Surfactants

“…Catalysis by CNSL-MTS supported copper(II) Schiff base lead to conversion of about 95% yield after 40 min (with turn over number of about 1000) compared to less than 5% yield without catalyst after the same reaction time. Similar high activity is observed in decomposition of hydrogen peroxide (98% conversion after 50 min) using copper(II) Schiff base catalyst immobilized on SBA-15 supports (pore size = 8.8 nm, surface area = 346 m 2 /g) [28]. Similar higher activity has also been reported in oxidation of sulfides to sulfoxides using H 2 O 2 catalyzed by copper(II) Schiff base complex containing MCM-41 (up to 98% conversion) [29].…”

Silica‐supported Cu(II)–quinoline complex: Efficient and recyclable nanocatalyst for one‐pot synthesis of benzimidazolquinoline derivatives and 2H‐indazoles

“…The silica was decomposed above 530°C. The TGA result indicated that the thermal stability of the Cu@QCSSi catalyst is considerable in comparison to that of previously reported Shift base catalysts . On raising the temperature to 300°C, only 2.65% of catalyst was decomposed.…”

“…The TGA result indicated that the thermal stability of the Cu@QCSSi catalyst is considerable in comparison to that of previously reported Shift base catalysts. [38][39][40][41][42][43][44] On raising the temperature to 300°C, only 2.65% of catalyst was decomposed. The TGA curves of amino-functionalized silica and QCSSi are illustrated in Figure 6.…”

Natural phosphate-supported Cu(ii), an efficient and recyclable catalyst for the synthesis of xanthene and 1,4-disubstituted-1,2,3-triazole derivatives

“…1,2 Recycling catalysts can minimize the consumption of auxiliary substances, concluding in economic and environmental benets. 3,4 To signicantly enhance the catalytic activity, a support is added to the reaction system; that is, the intimate contact between the supported ions and the support surface can favorably affect the reaction process. 5 Over the past decade, considerable attention has been given to recycling catalysts and heterogeneous metal-based systems, 6 including homogenous metal complexes or noble metals (e.g., Pt, Pd, Au, Ag, Ru, Cu) on inorganic substances (e.g., metal oxides, silica, clay, alumina, carbon) catalysts.…”